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Subgroup theorems and graphs. (English) Zbl 0366.20018

Comb. Math. V, Proc. 5th Aust. Conf., Melbourne 1976, Lect. Notes Math. 622, 1-27 (1977).

MSC:

20E06 Free products of groups, free products with amalgamation, Higman-Neumann-Neumann extensions, and generalizations
05C25 Graphs and abstract algebra (groups, rings, fields, etc.)
57M05 Fundamental group, presentations, free differential calculus